Method for producing celluloid-like substances.



peror, residing at Potsdam,

UN TED STATES PATENT, FICE,

osKAR BRUNO THlEME, OFPOTSDAM, i GERMANY,

METHOD FOR PRODUCING Specification of Letters Patent GELLULOID-LIKESUBSTANCES.-

Patented Sept. is, 1906.

Application filed Iiiril 10,1906. Serial Re. 310,982.

To all whom it may concern: I

Be it known that I, OSKAR BRUNQ THIEME, a subject of the King ofPrussia, German Emin the Kingdom of Prussia, Germany, have invented newand useful Improvements in the Methods for Producing Celluloid-LikeSubstances, Tof

which the following is a specification.

invention relates' to an im 'roved for producing ;ce uloidmethod andmeans like substances; and'the ob'ect of my inven-. tion is to obtain a;celluloid specific, advanta "by using for the gelatinizing of thenitrocellulose- 'radicals and by differently adapting such ureas totheir'tarious gelatinizing purposes or to the requisite qualities of thecelluloidlike substances, which are manufactured according to my newmeth od. Considerable? the latter over advantages are realized by b asedon the use other methods, which are a of various organic substancessusceptible of gelatimzing' nitrocellulose, thus forming sub-f "stltutesfor camphor, which, as it is known, is

generally usedjin celluloid manufacture as gelatimzing agent fornitrocellulose.

iti's insuflicient to have a substance of mere availablegelatinizing-efficiency. There are -'p numerous further conditionsto'which an ideal "cam horsurrogate must answer in celluloid-ma g. As itwas impossible till now to, discoverta rigorous relation between thechemical constitution of the gelatinizing medium and-its gelatinizingefliciency or- 1ts fitmiss for forming with nitrocellulose a well-' clinvestigations tothat effect have necessarily been limited in. generalto pure empiric method. Essenfrom the incompletely sub-.

conditioned c uloid, all

tially A differing stituted "ureas'as, for instance, phenyl-urea nothaving any gelatinizin from d1-.

- substituted ureas used for celluloid-making according to',my discoveryexercise an ermnent gelatinizing efle'ct upon collodion cot ton,producing, with-or without addition of the -usual working operations,tou h and not brittle celluloid. The important a vantages which arerealized by the greater part of the completely substituted substitutedureas canbe produced erably differing melting-points.

asymmetric diethyldipheny urea is 54? cen- -like -material ofhenyl- IHowever, attention must be called to'the fact that that in case-ofusing,

.luloid is made with camphor.

effect= upon nitrocellulose-the said comp etelyureas, when compared withcamphor are in eneral, he following: The manufacture of modorouscelluloid is made possible by the allowing at the same use of the saidureas,

qualities of time such vdetermination of the the celluloid-thatgrocesses may be effected and finished at any esirable temperature,because the tetra- Thus, for instance, the melting tem tigrade, whilesymmetric diethyldi urea liquefies' at 79,centigrade an tetrahenyl-u-reaat 183 centigrade. By convenently selecting the Incas or by mixing the,same with other substances afforded for varying the melting-point, so'that the tem erature at which the celluloid articles are shaped byressure can be modified' in accordance. t appears that such possibilityto regulate the ture may be of great advantage, and it will suffice torefer to the that the degree of temperature which must be applied in,manufacturing the celluloid is of great influence upon the stability ofthe nitrocellulose and; also of the goods made of celluloid. v g

Carrying into practice-my new method, the

the working and shaping of considfull liberty is a molding temperamostimportant fact improved cellulold is made in such amanne'r for instance,diethyldir henyl-urea the nitrocellulose is triturated with about halfits weight of-urea, the same rollers and presses being used which aregenerallyused in-the celluloid industry when cel- In certain cases theaddition of .oamphor has been found rational for the rocess ofgelatinizing.

. Having thus escribed my invention, what I claim as new, and desire tosecure byLetters Patent, 'is' f A method for producing celluloid-likesubstances which consists in wholly orpartly substituting the cam hor.hitherto used as elati-nizing medium. ureas in which the ydrogenassociated with the nitrogenis Sllbstitusted by organicradicals.

In testimony whereof I have signed my name to this' specification in thepresence of two'subscribing witnesses. a O KAR BRUNO THIEME.

Witnesses: I

-HENRY Enema, 7 WQLDEMAB HAUPT'. a

